I have about decided to do a single chip solution to
the dwell ignition problem  because  potentially it is the
cheapest way to do a stand alone ignition for use with a carb.
The knowledge gained can then be used to do a variety of simple
things including a trim table adjustment to the 555 fuel injection
system using spread sheet data as suggested by Henry Nee.

I will focus on assembly language as these are time critical jobs
and with assembly language you always know how long
it takes to do anything. If you keep the job  short and
simple the software size will be manageable from many aspects.

Further more I have considerable experience with assembly
language much of which can be applied to the AVR instruction
set.

I realize that most of you will not be interested so you
can delete the messages on the subject.

Those that wish to follow along can make a folder and move
the stuff over to that.

Tom Walter, I think, was the first to mention the
Arduino board as a good low cost and small AVR trainer that will
do a variety of jobs. The advantage is it is wired
for USB and there is programming software that runs
on both Windows and Linux.

There are a lot of people using this board around the world so there
should eventually be a lot of asm code examples.

The Arduino Mega 2560 is a small microcontroller board based on the ATmega2560.
 It has 54 digital input/output pins (of which 14 can be used as
PWM outputs), 16 analog inputs, 4 UARTs (hardware serial ports), a 16 MHz
crystal oscillator, a USB connection, a power jack, an ICSP header, and a
reset button. It contains everything needed to support the microcontroller;
simply connect it to a computer with a USB cable.

We will be using only a very few of these capabilities but the cost
and size is so low it does not matter.

AVRA is an assembler for Atmel AVR microcontrollers, and it is almost
compatible with Atmel's own assembler AVRASM32.

The initial version of AVRA was written by John Anders Haugum in 1999. He
released all versions until v0.7. All later versions were released by Tobias
Weber. And version 1.3.0 is released by Jerry Jacobs.


Paul Lamar